<?php
header('content-type:text/html;charset=utf-8');
$filename='http://www.maiziedu.com/course/list/';
$subject=file_get_contents($filename);
$pattern='#<img alt="(.*)" src="(.*)">#';
preg_match_all($pattern, $subject,$matches);
// print_r($matches);
foreach($matches[2] as $val){
    echo "<img src='http://www.maiziedu.com/{$val}'/>";
    echo '<br/>';
}